Stitching mechanism for mattress-roll-forming machines



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3 @HKJLL STITCBING MECHANISM FOR MATTRESS ROLL FORMUJG MACHINES FiledJuly 18, 1922 Q 14 Sheets-Sheet 1 J. W. DROLL STITCHING MECHANISM FORMATTRESS ROLL FORMING MACHINES Filed July 18', 1922 14 Sheets-Sheet 2 J.W, DROLL swmcmue MECHANISM FOR- MATTRESS ROLL FORMING MACHINES Filed Jly 18, 1922 l Sheets-Sheet 5 Dec- J- W. DROLL STITCHING MECHANISM FORMATTRESS ROLL FORMING MACHINES Filed July 18, 1922 14Sheets-Sheec 4 J.w. DROLL STITGHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES FiledJuly 18: 1922 14 Shets-Sheet 5 i g: Q

J. W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES lSheets-sheet 6 Filed July 18, 1922 J. N. DROLL STITCHING MECHANISM FORMATTRESS ROLL FORMING MACHINES 2 2 9 1 8 1 Y 1 H J 6 e 1 1 F Dec; 16.1924.. 1,5192% J.- w. DROLL s'M'rcnING MECHMIIIISM FQR- MATTRESS ROLLFORMING MACHINES.

' Filed Jul '18', 1922. l4'Sheets-Sheet 8 llllllg Dec; 16, H

r J. DROLL -STITCHING MECHANISM FOR MATTRESS ROLL ORMIIQG MACHINES FiledJuly 18, 1922 14 Sheets-Sheet 9 121mm Z M AWN mmN QMN MNN v J. w. DROLLSTITCHING MECHANISM FOR MATTRES ROLL FORMING MACHINES Filed July 18;1922 14 S heetsfisheet l0 Dec, 16, 1

J. W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES FiledJuly 18, 1922 4 SheetS-Sheet Dec. 9 1,519,299

J. W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINES FiledJuly 18, 1922 14 Sheets-Sheet 12 -Dec. 1 4. 1,519,299

' J. W. DROLL STITCHING MECHANISM FOR MATTRESS ROLL FORMING MACHINESFiled July 18, 1922 14 Sheets-Sheet 15 J. W. DROLL STITCHING MECHANISMFOR MATTRESS ROLL FORMING MACHINES Filed July 18 1922 14 Sheets-Sheet 14 Patented Dec. is; 1924.

. UNITED S T S- P l E -O C Jw DBOLIJ, CHICAGO, fiJLINOIS, f I

. stitchin AssIsnoR To DROLL rerrmrs conromrron or DELA ARE, Aconronarron or DELAWARE.

srlrcnnie rtncl'mnrsm 'roa mamaEss-no L-roamme- MACHINES.

To all whom it 4 Be it known that I. JosnrirW. DnoLL, a citizen of-theUnited States, residing in the city of Chicago, county of Cook, andState of Illinois,.have invented a new and useful Improvementin aStitching Mechanism for -Mattress-Roll-Forming}Machines, of which the:Eollo'wing is a specification.

My invention' relates to improvements in mattress Stitching machines andthe likeand is particularly directed :to an improved single t read. lockstitch forsewing; a roll upon the edge of a mattress or other piece 5 ofupholstery.

provide an improved machine for sewing a roll edgeupon mattresses'andthe like.

Another object is to provide an improved sewing mechanism wherein asewing needle and ashuttle. are actuated in timed relation to form alock stitch from a single thread.

A further object is to provide an improved sewing needle and actuatingmechanism therefor to permit the alternate engaging and disengaging of asingle thread to-form where y a continuous series thread while thestitches through the edge of a mattress.

Another object is to provide an improved shuttle arranged to dispense athread to a sewing needle during one portion of the sewing operation andto disengage said thread from the needle and lock the stitch -'durinanother portion of the operation of locked stitches may be formed from asingle sewing thread.-

A further object is to provide an improved needle having means foropening the eye thereof at predetermined moments to engage and disengagethe thread and to close said eye to prevent disengagement with thethrough the mattress.

A still further object is to provide an improved thread dispensing meanswhereby thread may be played out andslack taken up in timedrelation-with the movements of form stitch.

the sewing elementsto insure a firmand uni- A still further objectis toprovide' in imthe' stitching mechanism alongthe edge of a mechanismarranged to makexa The primary object of my invention'is to Q thread isbeing drawn I -App1icat1on filed July 18, 1922. Serial no. 575,812.

mattress to -form; successive -stitches there through. p v

Further objects are to provide for verti-- -cal and pivotal adjustmentof the stitching mechanism relative to the edge of the mattress wherebythe same may be adapted to dilfere'nt thicknesses and grades of work.

I accomplish these'and-other objects by means of the device disclosed inthe draw ings forming a part ofthe present specifica-. tion wherein likecharacters of reference are said;- specification and drawings and inwhich:

mounted upon amattrss supporting table. Fig. .2 is an elevation showingthe machine as viewed-from the right hand'side of.

Fig. 1. viewed from the left hand side of Fig. 1.

the 'roll forming means in operative positionv and the needle recededafter the first ad'- Vance.

Fig. 6 is a similar viewshowing the needle advancedthe secondtime.

Fig. 1 is a broken side elevation bi my improved mattress.stitchingmachine as Fig; 3 is an elevation of the machine as? Fig. 7 isa horizontal section showing the ,movement of the needle from thestarting position as shown inlfnll lines to the first advance as shownin dotted lines.

Fig. 8 is a similar view showing the needle receded after the firstadvance, and in dotted linesshowing the pivotal shifting of the needleprior to the second advance.

Fig. 9' is a similar 'view showing the needle being advanced the secondtime.

Fig. 10 is an enlarged detail partly in section of the needle and itsmounting.

Fig. 11 is-an enlarged detail showing-the manner in which the thread isengaged during the first advance'of the needle.

Fig. 12 is an enlarged broken transverse sectional detail taken upon theline 12-.l2 of Fig. 9 in the direction indicated, the

used to designate similar parts throughout o5 broken through the shuttlehousing, the shuttle be hand side of Fig. being shown in advance of thesewing needl showing the thread needle being shown in position for thesecond advance.

Fig. 13 is an enlarged broken transverse section of the head viewed fromthe right 2, the operating elements the startingposition. I Fig. leis asimilar view, portions being away to show the first movement-o theshuttle actuating mechanism.

Fig. 15 is a similar view showing the shuttle actuating means in asubsequent position.

Figs. 16 and 17 are broken front elevations of the headshowin'g theactuating gears for the thread dispensing member and the outer shuttlemember respectively.

Fi 18 is an enlarged transverse section ing shown in the position priorto the sec ond advance of the sewing needle.

- i 19 is a similar view showing the shuttle partially rotated after thesecond Fig. is a longitudinal section of the shuttle.

Fig. 21 is a section similar to Fig. 20 dispensing member in elevationin a partially rotated position.

Fig. 22 is a side elevation of Fig. 21, parts being broken away andshown in section. 4

Fig.2?) is an enlarged broken front elevation of a portion of themachine showing the means by which the machine is moved along the edgeof the mattress and supporting table.

Fig. 24'i's a the line 2 i24= of Fig. 23

indicated.

Fi is a sectional detail taken upon the line XX of Fig. 23 in thedirection indicated. I

' Fig. 26 is a in the direction horizontal'section similar to that shownin Figs. 7, 8 and 9, the position of the machine at the end of the seconreceding of the needle .being shown in full lines and the followinmovement of the machine .and the needle being shown. in dot-ted lines.

Fig. 27 is a broken section of a portion of a mattress showing themanner in which the stitches are formed through the edge to secure theroll.

Referring to the drawings it will be seen that my improved machineconsists of a supporting'frame 1 carried by suitable casters 2 mountedthereon and engaging achannel track 3 secured upon thesides of a worksupporting table 4, said frame 1 being guided by upper guide rollers 6enga ing the channel track 3 and lower guide r0 lers 7 and 8 engagingopposite sides of a channel guide 9 upon the lower portion of tablesupporting legs 11.

A frame 12 is slidablysecured upon the pinion 18 being in turn Thelower. end of I feathered into a sleeve 26.carr1ed at its horizontalsection taken upon 'upon the corresponding end f clination of the head,13 relativev to said table.

Within the ed ai cam 14 upon a'shaft 16, said cam 14 being providedwithgear teeth 17 upon the periphery thereof. The cam 14 is driven by apinion 18 mounted upon a shaft 19 and meshing with the teeth 17 of thecam; the driven by a-bevel gear 21 secured upon the upper end-of a driveshaft 22 and meshing with abevel gear 23 secured upon the adjacentend ofsaid pinion 18. The drive shaft 22 is mounted at its upper end within abearing 24 pivotally supported upon the shaft 19. the drive shaft 22 islower end within a bearing 27 pivotally mounted upon a shaft 28. A bevelgear 29 secured upon the lower end of the sleeve 26 is drivenby acorresponding bevel gear secured upon the shaft 28. The shaft 28 isdriven by a motor upon the lower portion of the frame 12 and connectedto the shaft 28 by means of a belt 33 mounted over a. suitable pulley 31mounted upon the outer'end of the shaft 28. Suitable transmission gears,36 are mounted in connection with the shaft 28 to obtain a variablespeed transmission, but as this construction forms no part of thepresent, invention and has been made the subject of a co-pendingapplication Serial Number 575,814, filed July 18, 1922, in which itis.fully described, no further description need herein be included.

A roll shaping element is mounted upon d the under side of-the head 18adjacent the edge of the table 4 to receive the edge of a mattress Msupported thereon, a roll edge being formed upon the edge of themattress by means of a pair of packing needles 37 slidably mountedwithin-guides 38 pivotally mounted upon the head 13' adjacent the shaperelement 35. The packing needles 3? are actuated bynicans of links -10connected between the needles 37 and actuating arms 39 secured uponshafts 41. The arm 39 actuating one needle 37 is provided with teethhead 13 is rotatablvmount- 32 adj ustably secured 42 upon the end remotefrom the link' 40.

said teeth 42 meshing with similar teeth of the arm 39 actuating theother needle 37. are operated by means of a lever 43 secured upon thetoothed portion of one of the arms. and carrying a roller 44. engaging agroove 46 upon the cam 14E,'whereb "said arms are moved simultaneouslyThe arms .39 1

to force the needles 1 be moved'tothe position shown in 37 downwardlyfront th a position as shown in Fig; and top of the mattress M are thenmoved pivotally ing the cam thus causing the needles 37 to therebycausing a portion of'the .stufling within'the' mattress .to be gatheredand forced into the corner of the mattress within the shaping element35,-to form a roll,-the

forming'and shapingflthe roll. Asthe, roll forming andshapmg means formsno part of the present invention and is fully described; in a copendingapplication, Serial No. 575,813, filed July 18 1 922, a detaileddescription of the construction and operation of the sameis omittedherefrom.

When the roll has been formed in the manner above briefly described itis permanently secured by means of stitches made'by means of a sewingneedle 51 one end of which is I t 6 and 9 of the draw ngs after which aSillll" removably secured "to a block 52*s1idably mounted upon-a guide53 'pivotally' mounted as at 50 upon the head-13fof;the, machine.

The block 52 isprovided-with an'extension P 54 upon .the outer sidethereo'fwhich carries P shaping element 35 by the packing needles :1flexible coupling 56 engaging a slot57vin one end of a lever 58 theother end of which is pivoted upon a shaft 59 secured within the head13. The lever 58 isactuatedto ad- -vanceand recede the block 52 and theneedle 51 along the'guide 53 by means of an arm 61 pivotally connectedat one end thereof to the lever 58, the other end of said arm61 beingprovided with a slot 62 slidably engaging a guide 63 pivotally mountedupon the cam supporting shaft 16. Aroller 64 is mounted upon the arm 61to engage a groove 66 formed in the adjacent side ofthe cam 1a wherebythe desired movement is'imparted to the arm 61 and lever 58. The

lever 58 is hinged as at 6.0 to accommodate the transverse movement ofthe needle.

A second groove 67 is formed inthe side of the cam 14 to engage a roller68 mounted upon one end of a bell crank 69 pivotally mounted upon ashaft 71 secured within the head 13, the other end of said crank 69being connected by a link 72 to a lever 73 which is in turn connected bya link 74: toa block 76 slidably mounted for transverse movement. Theblock 76 is secured upon the free end of the pivotally mounted guide 53and is'apertured to receive and form a guide for the needle 51.

The needle is normally held in its extreme receded position while theroller 64: is engaged by that portion of the cam groove 66 which is mostremote from the center of the cam. As the cam is rotated from thestartas- 56f links 1 -4-.7 actuated by suitable connections engag-f' 4of the drawings that the needle is maintained its no; 1; recededposition for a consid'; rable por t ond the rotatiomthepontour of thegroove'l then causing theroller; 4"jt'0 benioved toward the centerof'the' can; thereby causing the arm.61 to bemoved along the guide 63and the-lever- 58 swung 'about'its' *ivot 59 to the position shown indotted ines, continued rotation of thecam causing 'm'al receded'position as shown in Fig.- 5.

67 thereby moving the bell crank 69 about its pivot. which movement iscommunicated through the link 7 2, lever 73 and link 7 4 to 'the'block76, thereby causing said'block to a second-timeto the position shown'inF gs.

osition; Each advance causes theneedle to en'etrate through the rollformed within the 37,the second penetration, however, being atapoint'slightly spaced-from the point of the first penetration,- theobject of which will hereinatterbe more fully explained.

. Theneedle 51 is provided at its forward end with an eye hereinafterdescribed. The other end of the needle is threaded into a member 201mounted within the upper 'portion of the block 52 and removably-securedtherein by a locking member 202 slidably mounted within an extension 203of the bloc-1:52, said member 202 being normally depressed by a spring204 to engage a notch 205 formed upon the upper side of the member 201,"whereby said member'is normally.

locked in its operative position. The for;

ward end. of the me her-'201'is beveled as at 206 to facilitate theintroduction of the member into engagement with the locking member. Therearward end extends outwardly through an aperture 207 in the frame 13and is knurled as at 208 to. ermit the member to be readily turned suciently to lift the locking member-when it is desired to remove theneedle.

The member 201 is provided with a longitudinal bore 209 adapted toreceive 2 plunger 211 slidably mounted therein an carrying a rod 212extending through lillt forward end of the member 201 and into 2longitudinal groove 213 formed upon thr lower side of the needle 51,said rodextend ing to the point of the needle to close th\ of thecam'causes the needleito be advanced.

- the several parts to be returned jtothe'nor- As the. needle approachesthe receded po- ,sition' after the above; described advance the roller68 is moved outwardly bythe groove.

"further rotation causes the needle to be're- I coded and shifted to thenormal starting cured upon the plunger parallel to the rod 212 andextending outwardly from'the forward end ofthe member 201 below theneedle 51, for reciprocating the plunger and the rod 212 relatively-tothe needle.

A rocker arin 217 is pivotally mounted upon a lug 218 formed uponthe-frame 13, saidrocker arm having one end thereof forked to engage apin 219 secured upon the'block 76 whereby the rocker arm is prevented.

oscillated to more the free end 221 into alignment with the actuatin rod216 when the needle is in osition for t u: first advance,

and'out of sai ilignment when the needle is moved to'its position forthe second advance. The free end .221 is preferably forked to span theneedle 51 to insure against vertical displacement when the rod 216-is'moved tliereagainst during the first advance of the needle to open theeye as hereinafter described.

A shuttle designated in general by the numeral 81 is mounted within asiuttle housing 82 formed within the lower portion.

of the head adjacent a the shaper element 35 upon the side opposite theneedle 51. The shuttle 81 consists of an inner shuttle member 83withinwhich is mounted a bobbin 81 upon 'wlii'ch is wound a suitable length ofsewing thread 86. An outer shuttle member 87' including a gear portion88 is rotatably mounted upon the innershutt le member 83. A threaddispensing member-89 provided with a gear portion 91 is mounted upon theinner'shut-tle member 83 and isadapted for independent rotation relativeto both the inner and outer shuttle members. The preferred constructionof the shuttle 81 is fully disclosed in Figs. 20 and 21 of the drawings.The members 83, 87 and 89 are held in assembled relation by means of amember 92 threaded between the inner shuttle member 83 and a retainingring 93, said member 92 being longitudinally apertured to reeeive'thethread 86 and provided with an outwardly extending portion 91 'arrangedto loosely engage a corresponding opening 96 in the shuttle housing 82,whereby rotation of theiniier shuttle member is The thread 86 wound uponthe bobbin 81 is dispensed therefrom through an aperture 97 between theinner and outer shuttle member, said thread being passed under a spring98 mounted upon the outer end of the inner shuttle member 83 andarranged to maintain a slight tension upon the thread.

The inner shuttle member 83 is provided with upon a shaft an outwardlydisposed lug 99 having an aperture 101 threthrough aligned with anaperture 102 in the outer end of tlte shutthe member 83'and also alignedwith an aperture .103 formed through the retaining ring 93 whichaperture 103 coinriiunicates'with the aperture through the nieiirbgifizsT he thread dispensing member, 89 is pi'ovided with a pair of inwardlyextending lugs 104 arranged to span the lug 99 and having apertures 106corresponding to the aperture 101 therethroughu: The thread 86-is-earried from thespring 98 through the aperture 102, the apertures106 and aperture 161, and thence through the aperture and the member' 92as shown in Fig. of the drawings. From the member 92 the thread iscarried past raised portions 107 and 108 formed upon a plate/109 betweenthe shuttle housing 82 and the roll shaper element and thence under aspring 111 to' the mattress roll, as best shown in Fig. 11 of thedrawings, said spring 111 serriiig to maintain a slight tension upon thethread.

Thc thread dispensing member 89 is actuated through the gear portion 91by means of a gear 112 inoimted upon a shaft 113 and carry ng a pinion114 connected thereto, said pinion being driven by agear 116 mounted117. The gear 116 has a gear 11.;- connectedthereto which gear llii isdriren by a. .gear 119, mounted upon a shaft 121. The gear 119.isconnected with av gear 122 which is engaged by a rack 123 arranged tobe; rec-iprocated by means of a lever 124 to one end of which the 'rack123 is pivot ally secured. The lever 124 is pivotallv ll'ifillllld uponthe cam supporting shaft 16 and is connected by a link 126 and arm 127pivotally mounted at one end thereof upon ashaft 128 and carrying aroller 129 at the other end which roller engages a groove 131 upon theadjacent side of the cam 14 whereby said arm is oscillated.

The outer shuttle'nieiiibcr 87 is actuated in a. similar manner by meansof a pair of pinions 132 meshing with the gear portion 88 of saidshuttle iiieinbci'. The. pinioiis 132 are driven siinultaneouslv by agear 133 mount-ed upon the shaft 117. one of the pin ions 132'beingmounted upon the shaft 118 and the other uponfa' shaft 134. The gear 13has a gear 136 connected thereto. said gear 136 being driven by a gear187 mounted upon the shaft 121 and having a gear 138 connected thereto.The gear 138 is engaged by a rack 139 meshing therewith and arranged tobe recipi'oca-ted by iiieans'of a lever 111, pivotally mounted upon theshaft 16 and to one end of which the rack pivotallyconnected by means ofa link 142. The other end of the lever 141. is pivotally connected toaiiarm 143 by means of a link 144,, said arm l lti being pivotally mounted35' 4 between the: shuttle and the spring 111.

closed by the.

lation to the from becoming close the opening151 and prevent the threaddisengaged from the needle drawn throughthe needle.

as the thread is- Simultaneously with the receding. of the Ring-"111pthe thread, the

needle afterpic thread dispensingfmember 89 is rotated by the action ofthe cam groove 131 upon the form-stitch through the roll .formed uponIt; the edge, f the-mattress M inthe'following manner; Assuming theshuttle properly 'threadedl'andithe machine in operative engagement withthe mattress, the roll .being Fig; 11 of the; drawings.

"'4 will by virtue 0 formed and-temporarily held by the pack?'ing-needle 37, rotation of the cam 14 from thelnormal startin I thegroove 66 engaging the roller 64',- cause vanced- -to the positionshownin. dottedlines inFigs, {Land 7,, and in full lines in I The point oftheneedle 5.1.is forced through the mattress roll and thereafter passesbetween the twolraised portions 107 and 108-upon the plate 109,

and in ,so doing the tapered point of the p'ositionshown in Fig.

the needle to be first adneedle passes over and slightly depre'sses thethread 186 which is maintained taut between ;-the shuttle 81 and thespring 111.

Upon the under side-of-the needle point is .fornied an angularlydisposed opening 151 communicating with a slot 152 formed through theneedle near the .point and constituting the eye of the needle, theinclination of the opening 151 corresponding to the angle at which thethread 86'extends The opening 151 is normally forward/end of the'rod212,'which, as above explained, is disposed. within a. groove is movedagainst formed in the lower side of the needle and extending past A,needle approaches-the end of the forward the end 221 of the rocker arm217, and the plun er 211 and the rods 216 and 212 arreste 'The forwardmovement of the needle' itself however continues for a short distance,the plunger being moved into the bore 209 against the pressure of thespring 214 and the rod 212 moved along the groove.

213-until the end of the rod 212 clears the opening-151 and thus opensthe eye of the needle. In this manner, as the needle approaches itsextreme forward position, the thread is admitted through the opening 151into the slot 152. As the needle is now replunger ceded by a furtherrotation of the earn, a loop of the thread will be drawn from theshuttle through the roll ofthe mattress. As the needle is movedrearwardly, the rod 216 is disengaged from the arm 217 and the movedforward to its normal position within the member 201 .by thespring 214,the rod 212 being thus moved to again said opening 151. -As the.

forward movement of the.

arm 127 and -the intermediate connections, to dispense the amount ofthread necessary to formthe loop, said amount'of thread having beenpreviously taken up by the thread dispensing-element from the. bobbin84-. as shown in ig. 21 of the drawings by a rotation of said -threaddispensing element in the reverse direction at the end of the previous.stitch in a mannerhereinaftenmore,

fully explained.

As the needle receded vlrtue of engagement of the groove 67 with 51approaches the extreme the roller '68 and its oonnections jwiththe'position it is shifted transversely by-- blocl: 76' to the positionshown indotted.

lines, in Fig. 8 of the .draWi'ngs- As ,the needle '51 is shifted thethread 86 carried thereby'i's moved'over' the hook 153 which is sopositioned as to clear the-end of the needle. during. the shift andhaving a 'dee pressed end 154 arrange'dto cause the thread to .becarried upwardly thereover intofena thread retaining, shoulder gagementwith p 156 as best shownin Figs. 9. and 12 ofthe drawings. The movementof the block- 76 in shifting the needle to position for the secondadvance imparts a pivotal. move-.

ment to the rocker arni 217 which is enabove explained,v crating toswing'j gaged by the pin 21'9.as said pivotal movement 0 the end22101112 of the pat .of the needle 51 and the block 52. As the needle.51 is now' advanced-in the shifted position the'thread ,will be: drawnover the hook 153, the thread movement, the plunger actuating rod 216'dispensing member' 89 bein actuated to continue dispensing the re thread86. Upon' the secon needle the point is moved to a'fpo'int closely tinpin i ons 132 being .so spaced as to insure enthe edge of the outershuttle as shown in Fig. 9 of the drawings. As the needle 51 ap roachesthe'end of the advance movement, t e actuating rod 216 is movedintoengagement withthe block 7 6 and'theplunger211 and rod 2.1.2 recededrelative to the needle in such 'manner as to again open the eye of the.needle by uncovering' the opening 151 in the manner above de scribed.

The outer shuttle member is provided with a thread engaging hook 157formed by cutaway'a portion of the periphery, the

parallel. .to member 87 gagement of one pinion with the -gear por+ tion91 while the cut away portion passes the other pinion. The hook 157 isnormally ulsite length of advance of the positioned "immediately abovethe level of.

the needle when advanced in the shifted positlon above described. At theinstant the 51 is moved rearwardly, the two movements being so timed asto cause the thread 86 as it is engaged by the hook 157 to be movedengaged by outwardly through the opening 151 and thus become disengaged"from the needle. The rotation of the outer shuttle member 87 iscontinued, the portionof the loop of thread the hook 157 being therebycarried entirely around the shuttle as shown in Fig. 19 of the drawings,the space between t'he'sh'uttle and the shuttle housing 82 beinginsufficient to admit the other portion of the loop, not entering thecut away portion formingfthe hook. The space between the extension 94and the recess 96 in the housing 82 is sufiicient to ermit the loop topass therethrough, the t over that portion of said thread extending f isfeathered into a sleeve 181 connected by read thus being looped from theshuttle tothe mattress. Thread is dispensed by the member 89 until theloop passing over the shuttle has'passed the cen- 'ter thereof afterwhich the direction of Tatation is reversed by action. of the cam groove131 and the slac thread caused as the loop slips past the shuttle; istaken up and the stitch drawn tight.

The stitch formed is illustrated in Figs. 26 and 27 of the drawings. Itwill be noted that the loop carried throughthe mattressupon the returnmovement of the needle after the first advance is given a half twist asit is moved over the hook 153- so that .when the loop is carried throughthe mattress the'second time and carried around the shuttle a knot isformed. The twisting of the loop is due to the resistance offered by thehook 153 to movement thereover and to the adjustment of the relativetension at op posite ends of the loop. This feature of my invention isimportant for the reason that by forming each stitch into a knot asshown each stitch is effectually locked and the breakage of the singlethread at any point will not effect the other stitches.

.\s the stitch is beingcompleted, the packing needles 37 are actuated bythe cam 14-. to disengage the mattress roll and are brou ht back to thenormal sta'rting'position. mmediately thereafter the entire machine isadvanced along the edge to the mattress into position for making asucceeding stitch.

The forward movement of the machine is accomplished briefly as follows:A sector gear 161 piv'otally mounted upon the shaft 146 is arranged tobe oscillated by alink 162 connected to one end of a lever 163-piv'-pivotally otally connected at the other end thereof to acrank 164 andarranged to he moved by said crank about an adjustable pivot 166. Thecrank 164 is secured upon a shaft 167 'which is oscillated by means ofan arm 1G8 engaging the groove 46 by meansof a suitable roller.

A forked member 169 pivotally mounted upon a shaft 171 is arranged to bemoved through. a short are by means of a link 172 connecting one.portion of the fork 39 by which the packing'needles 37 are operated. Themovcment of said lever 39 in moving its packing needle to disengage themattress M causes the forked member 165) to be sufliciently elevated tomesh with the sector 161, said gears 17 being mounted upon a shaft 17 1carried between the arms of the member 169. A. bcvcl gear 176 is securedin connection with the gear 173, said bevel gear l76'1neshing with acorresponding bevel gear 177 secured upon the upper end of a shaft 178.The. upper end of the shaft 178 is received within a pivotally mountedbearing 179 carried] by the shaft 174. The lower end of theshaft to oneof the lovers means of a'universal joint 182 to an clongated pinion 183meshing with a gear 184 mounted upon the supporting frame 1. The gear184 meshes with a rack 186 secured along the edge of the work supportingtable 4 whereby the entire machine is moved relatively to the table anda mattress supported thcrcon when the sector 161 is actuated in themanner above described. The distance moved by the machine during eachrevolution of the cam 14 is varied b v raising or lowering the pivot 166to vary the throw at the upper end of the lever 163. \Vhen the cam 14 isfurther rotated to the point where the members 39 are actuated bring agear 172-1 into to again more the packing needles 37 into the mattress,the forked member 169 will be lowered to move the gear 173 out ofengagement with the sector and into engagement with a rack 187 'wherebythe machine is locked against further movement: The forward movement ofthe machine relative .to the mattress together with'the reverse movementof the thread dispensing member 89 causes the stitch to be drawn tightand the thread 86 to be drawn into position to starting position duringthe forward movcment ofthe machine as shown in dotted lines in Fig.26ofthe drawings.

The feathered connection provided upon the shafts 22 and 178 is providedfor the purpose of admitting vertical adjustment.

of the frame 12 carrying the head 13 relative to the supporting frame 1by means

